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Engine Temp Water Coolant Temperature Sensor Switch Hyosung GV125S EFi Bobber GV300S

Estimated delivery dates: Nov 19, 2026 - Nov 20, 2026

£29.99

⚙️ WATER TEMPERATURE SENSOR // THERMOSTAT HOUSING PLUG

Fix incorrect dash temperature readings instantly. This genuine factory-made sensor screws directly inside the metal thermostat housing shell to send live heat data to your speedometer clock panel and ECU brain loop.  This is for the EFi bobber models from 2019+ onwards such as GV125-S , GV300-S , GV300R , GV125R-Roadster. 

  • Location Check // Sits on top of the engine inside the thermostat shell block. This is not the thermo switch plug screwed into the side of the radiator fins.
  • In Stock // Ready for your next cooling service fix.
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Description

Getting the exact fluid temperature readouts is vital to keep your modern fuel-injected bike operating in safe parameters. This replacement item is a component sourced directly to swap out fouled, corroded, or dead internal sensors. When this plug fails, your dash display may read completely cold or trigger random warning lights because you need the sensor working fully to feed temperature info back to your clocks without causing diagnostic errors.

💎 Technical Properties

Thermostat Temperature SensorGenuine factory part with sealed brass body casing and electrical connector plug. Mounts inside the central thermostat block. OEM References17650KG7200
17650hG7200

📜 Confirmed Fitment Guide

Hyosung Models: Fits the following models below only.

  • GV125-S Bobber EFi , GV125-SS EVO, GV125R Roadster: 2019 to Present Day.
  • GV300S Bobber, GV300SS EVO, GV300R: 2019 to Present Day.

❌ EXCLUSIONS (WILL NOT FIT):

  • Older GV125 Carburettor Models: Will not fit any build from 2001 to 2018. Those older bikes are completely oil-cooled, utilize carbs, and do not run a liquid thermostat assembly.
💡 RECOMMENDED PAIRING: If your cooling fan is failing to spin when the bike gets hot, your issue is likely the radiator fan switch instead of this engine block plug. We stock the radiator fan switch on our store. View Radiator Cooling Fan Thermo Switch 

🔧 Install Tips

  • Wait until cold: Never work on the thermostat shell area while the engine is hot. Liquid cooling channels hold intense pressure that can spray boiling fluid and cause severe skin burns.
  • Flush the fluid: Removing this item from the top of the housing will break the fluid seal and drain the upper passages. Take this moment to completely flush out your old aging engine coolant and refill with fresh fluid.
  • Clear trapped air loops: After tightening the new plug to factory specifications, you must bleed the air locks out of the cooling system. Trapping pocket bubbles inside the housing will cause false dash readings. Please consult your official workshop manual or visit a professional bike dealer or local mechanic to ensure the fluid path flows correctly.
📧 NEED TECHNICAL HELP? Have a sales question or need help matching a part code to your bike build? Email us . Our team answers every sales message daily to get your project moving.

Additional information

Weight 1 kg
Dimensions 10 × 10 × 4 cm

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